Παραπομπή APA

Karpagam,M. (1991). Environmental economics: A text book. Sterling Publishers Pvt. Ltd.

Παραπομπή Chicago Style

Karpagam,M. Environmental Economics: A Text Book. New Delhi: Sterling Publishers Pvt. Ltd, 1991.

Παραπομπή MLA

Karpagam,M. Environmental Economics: A Text Book. Sterling Publishers Pvt. Ltd, 1991.